code: def test_parameter_not_modified():
      """Tests the original dataframe is not modified"""
      data = pd.DataFrame(
          data={
              "id": ["a", "b", "c", "d"],
              "objective": [0.1, 0.2, 0.3, 0.5],
          }
      )
  
      result = regret(data)
  
      assert len(data.columns) == 2
      assert len(result.columns) == 4
  
file_path: orion/tests/unittests/analysis/test_regret.py
imports: import pandas
  import pytest
  from orion.analysis import regret
label_desc: Use image node_id 3 for calling a global function with example usage: test_parameter_not_modified() without return types